nullprefixer.java

来自「java pos,你可以直接编译运行,」· Java 代码 · 共 82 行

/*
 * Copyright (c) 2000 jPOS.org. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *  3. The end-user documentation included with the redistribution, if any,
 * must include the following acknowledgment: "This product includes software
 * developed by the jPOS project (http://www.jpos.org/)". Alternately, this
 * acknowledgment may appear in the software itself, if and wherever such
 * third-party acknowledgments normally appear.
 *  4. The names "jPOS" and "jPOS.org" must not be used to endorse or promote
 * products derived from this software without prior written permission. For
 * written permission, please contact [e-mail].
 *  5. Products derived from this software may not be called "jPOS", nor may
 * "jPOS" appear in their name, without prior written permission of the jPOS
 * project.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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 * PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the jPOS Project. For more information please see
 * <http://www.jpos.org/> .
 */

package org.jpos.iso;

/**
 * AsciiPrefixer constructs a prefix for ASCII messages.
 * 
 * @author joconnor
 * @version $Revision: 1.3 $ $Date: 2003/11/05 09:00:21 $
 */
public class NullPrefixer implements Prefixer
{
    /** A handy instance of the null prefixer. */
    public static final NullPrefixer INSTANCE = new NullPrefixer();

    /** Hidden constructor */
    private NullPrefixer()
    {}

    /*
	 * (non-Javadoc)
	 * 
	 * @see org.jpos.iso.Prefixer#encodeLength(int, byte[])
	 */
    public void encodeLength(int length, byte[] b)
    {}

    /**
	 * Returns -1 meaning there is no length field.
	 * 
	 * @see org.jpos.iso.Prefixer#decodeLength(byte[], int)
	 */
    public int decodeLength(byte[] b, int offset)
    {
        return -1;
    }

    /**
	 * @see org.jpos.iso.Prefixer#getLengthInBytes()
	 */
    public int getPackedLength()
    {
        return 0;
    }
}